Abstract
The improvement of the performance of organic photovoltaic cells (OPVCs) and the photogeneration process in these devices may occur via multiple mechanisms depending on their structure and/or architecture. For this purpose we investigate how self-assembled monolayers of thiol molecules (C12H25SH and 3T(CH2)6SH) and benzoic acid molecules (ABA and NBA) affect the efficiency and the photogeneration of free carriers in a sexithiophene based photovoltaic cells. Firstly, we provide the results of absorption spectra for samples with SAM of thiol that show there effect on orientation of 6T molecules on these structures and the organization degree of the thiol molecules on ITO substrate. Afterward, we describe from current vs. applied voltage after illumination, the enhancement of the performance of these cells. In the second, we study the effect of SAM of benzoic acids molecules on the photovoltaic behavior. A theoretical model is used for quantitative description of the open circuit voltage as a function of carrier’s generation rates at the electrodes. The results of I-V characterization under illumination show that open circuit voltage as well as short circuit current is dramatically affected by the dipolar layer. The orientation and the magnitude of dipole moment of benzoic acid molecules are the crucial factors that affect the organic photovoltaic parameters.
Highlights
Organic semiconductors materials are potential candidates in electronics industry, more diversified and less expensive
It is by proceeding that we were able to conceive a multitude of electronic structures such as organic light-emitting diodes (OLEDs) which cover the totality of the visible spectral field and organic photovoltaic cells (OPVCs)
We present in this article the methods for improving performance of sexithiophene based photovoltaic cell through introduce a self-assembled monolayer of thiols molecules differed with functional groups (C12H25SH and 3T(CH2)6SH) (Figure 1(b) and Figure 1(c)) and benzoic acid molecules (Amino-Benzoic Acid and Nitro-Benzoic Acid) (Figure 1(d) and Figure 1(e)) on ITO in order to control photocarrier generation at the interface ITO/organic and to provide an increase in device efficiency
Summary
Organic semiconductors materials are potential candidates in electronics industry, more diversified and less expensive. The development of organic photovoltaic cells (OPVCs) is still a matter of research despite their low efficiency relatively to mineral ones which is precisely a crucial factor for their commercialization This is due to mainly two reasons. Self Assembled Monolayers (SAMs) which were widely used in OLEDs are supposed to induce modification of metallic electrode work function leading to significant improve of carrier injection into the organic semiconductor. We are interested in this work on photovoltaic cells based of the α-sexithiophene (6T) molecules (Figure 1(a)) The characteristics of these molecules apart their stability and facility of synthesis, they are essentially motivated by their structural order, the degree of organization and the big purity which offers to oligomeres contrary to polymers. A theoretical model is used for quantitative description of the open circuit voltage as a function of carrier’s generation at the electrodes, and can explain the effect of orientation and the magnitude of dipole moment of SAM of benzoic acid on the photogeneration rate of free carriers and their effect on the organic photovoltaic parameters
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